When the passenger ferry MV Sewol sank off the coast of South Korea in 2014, more than 300 people lost their lives, most of them schoolchildren. Years later, the victims’ families and survivors are still demanding justice from national authorities. Yi Seung-Jun’s work focuses on the life of unseen minorities, which has informed his signature style of filmmaking. He has directed several feature-length documentary films, including the award-winning PLANET OF SNAIL (2011). AFI spoke with him about the documentary, which screens at AFI DOCS as part of Shorts Program 2 at the AFI Silver Theatre in Silver Spring, MD on…